Alexandra is married, and lives with her husband and daughter in Key Biscayne, Miami, Florida.

Kosteniuk is now ranked only 31st in the current FIDE rating list for women.[3] She is no longer playing regularly. The highest rated woman, Judit Polgar (Hungary), never plays in female events. The second highest rated woman is Humpy Koneru (India); she has never won the women's world championship.